Texas Instruments ADS7951SRGER

Overview

ADS7951SRGER from Texas Instruments is a 10-bit, 8-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and integrated programmable alarm thresholds per channel. It features a 20-MHz SPI-compatible serial interface, dual software-selectable input ranges (0 to VREF and 0 to 2×VREF), and operates from 2.7–5.25 V analog supply. It is used in industrial PLC signal monitoring where multi-channel, deterministic timing and alarm-triggered event capture are required.

For engineers reviewing the ADS7951SRGER datasheet, ADS7951SRGER pinout, ADS7951SRGER application, or ADS7951SRGER equivalent, key selection considerations include its 8-channel count, 10-bit resolution, TSSOP-30 package footprint, GPIO-configurable alarm outputs, and compatibility with unbuffered or PGA-buffered analog front-ends such as THS4031.

Technical Context

The ADS7951SRGER implements a capacitor-based SAR architecture with inherent sample-and-hold, sampling on the falling edge of CS and using SCLK for conversion timing and serial data transfer. Its auto-sequencing mode supports preselected channel cycling, while manual mode allows host-directed channel selection per conversion cycle.

It supports two independent input voltage ranges via the RANGE pin (GPIO2), enabling flexible scaling against external reference (REFP/REFM). The device integrates four configurable GPIOs in TSSOP-30 - including dedicated high/low alarm outputs and power-down control - and delivers 47 MHz input bandwidth with typical 14.5 mW power dissipation at 1 MSPS (VA = 5 V, VBD = 3 V).

Key Specifications

Pinout & Package

ADS7951SRGER is housed in a 30-pin TSSOP (DBT) package measuring 7.80 mm × 4.40 mm, with exposed thermal pad (not electrically connected). Pin functions are validated per TI SLAS605C Rev C (July 2018), Table 7 (TSSOP Packages).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with ADS7953SRHRT and ADS8684IPWR, ADS7951SRGER offers optimal balance of 10-bit resolution, 8-channel count, 1-MSPS speed, and TSSOP-30 footprint-making it ideal for cost-sensitive, space-constrained industrial and medical signal acquisition where moderate precision suffices.

Availability

ADS7951SRGER is available at Aetrix Electronics and suitable for PLC/IPC signal acquisition, optical line card telemetry, medical patient monitor front-ends, digital power supply monitoring, and high-speed closed-loop control systems requiring stable component supply and long-term manufacturability.

Supply support for ADS7951SRGER includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial interface solutions.

The ADS79xx family-including ADS7951SRGER-is designed specifically for multi-channel, medium-speed industrial data acquisition, emphasizing pin compatibility across resolutions (8/10/12-bit), alarm autonomy, and flexible power domain separation.

FAQ

What is the maximum sampling rate of the ADS7951SRGER?

The ADS7951SRGER achieves a maximum sampling rate of 1 million samples per second (1 MSPS). This rate is sustained under recommended operating conditions (VA = 2.7–5.25 V, VBD = 1.7–5.25 V, fSCLK ≤ 20 MHz) and enables real-time capture of signals up to 500 kHz (Nyquist-limited). The ADS7951SRGER maintains zero-latency behavior at this rate, delivering each conversion result without pipeline delay.

Does the ADS7951SRGER require an external reference voltage?

Yes, the ADS7951SRGER requires an external precision reference applied to REFP and REFM pins. It does not include an internal reference. The device supports two input ranges: 0 to VREF and 0 to 2×VREF, selected via GPIO2 (Range pin). A common choice is the REF5025 (2.5 V ±0.1 V), which provides the stability and low noise needed to achieve the ADS7951SRGER's specified 10-bit performance.

How many analog input channels does the ADS7951SRGER support?

The ADS7951SRGER supports eight single-ended analog input channels (CH0 through CH7), plus optional differential input via AINP/AINM. All eight channels are accessible simultaneously through the internal multiplexer, with MXO serving as the common output node to the ADC core. Channel selection is handled either automatically (predefined sequence) or manually (host-directed per conversion).

What package type is used for the ADS7951SRGER?

The ADS7951SRGER is packaged in a 30-pin TSSOP (Thin Shrink Small Outline Package), designated DBT by Texas Instruments. Its nominal body size is 7.80 mm × 4.40 mm, with a standard 0.5 mm pitch. This package includes four GPIO pins (GPIO0–GPIO3) and exposes a thermal pad (not electrically connected) to aid heat dissipation in high-density layouts.

Can the ADS7951SRGER operate with separate analog and digital supply voltages?

Yes, the ADS7951SRGER uses independent supply domains: +VA (2.7–5.25 V) for analog circuitry and +VBD (1.7–5.25 V) for digital I/O. This separation minimizes noise coupling between analog and digital sections. AGND and BDGND must be connected at a single point (typically near the device) to maintain ground integrity while preserving domain isolation.